In stm32f7 , ther's not a SPL so there's not a trick to switch from SPL to LL or HAL .
Maybe, by digging here:
SPL2LL-Converter - STM32 Standard Peripheral Libraries to STM32Cube Low-Layer APIs migration tool - STMicroelectronics
Here the tool SPL2LL converter published in the web which allows you to convert your SPL application to a Cube one based on LL code.AN5044 shows the steps to migrate from an existing STM32-based application developed under the STM32 SPL to any one of the other microcontroller types using the STM32Cube LL drivers.Hope this helps you.
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